$\"\"$

The level of sound formula $\"\"$ .

The initial intensity value, $\"\"$ watt per square meter and rustle of leaves of intensity $\"\"$ watt per square meter.

$\"\"$ (Write original equation)

$\"\"$ (Substitute values of $\"\"$ )

$\"\"$ (Simplify)

$\"\"$ (Use calculator) $\"\"$

The level of sound $\"\"$ .